Analogue Bitmap Clock displays the current time with hours and minutes in an analogue fashion but unlike the traditional clock; unlike ordinary analogue clocks, this design is clear even in very small bitmaps.

acrotsr is an IRC game in which players are given an acronym. The players have a certain amount of time to think of what the acronym should stand for, then the people in the channel vote for the one they like most.

Adonthell is a role playing game in development that aims to combine the best features of the Final Fantasy and Ultima series with an epic plot. It is set in a detailed virtual world. With the current engine, a small demo game (Waste's Edge) is available.

Afghan Hound Quote of the Day Daemon uses
both TCP and UDP port 17 to return a random
quote from fortune(6) style quote files. It has
performance benefits over other programs which
use fortune(6) to source their quotes. The server
also includes the ability to limit the number of client
connections per second. Client and benchmarking
programs are included in the package.

AIME is a C++ MUD engine with an OO design, designed to provide utmost flexibility for the designer to create complex worlds. It has a fully-functional builder port, online interpreted specials code, and a flexible levels/quest/profession track system to allow the game owners to set up any world they can imagine.

Airtraffic is a game/simulator that puts you into an air traffic controller's hotseat. Planes come into your airspace from various directions and you have to guide them safely to their destinations. It uses Python, Corba, and GTK.

Aleph One is a 3D first-person shooter game based on the game Marathon 2 by
Bungie Software. It is set in a Sci-Fi universe dominated by deviant computer
AIs and features a well thought-out plot. Aleph One was originally a MacOS
game, but a cross-platform version ("Aleph One/SDL") based on the Simple
DirectMedia Layer (SDL) library is currently under development which runs under
Unix, BeOS, and Windows.

Allegro is a multi-platform game library for C/C++ developers that provides many functions for graphics, sounds, player input (keyboard, mouse, and joystick), and timers. It also provides fixed and floating point mathematical functions, 3D functions, file management functions, compressed datafile, and a GUI.

GNOME-Mud (formerly AMCL) is a Multi-User Dungeon (MUD) client that aims to make mudding a bit easier. It can define aliases, triggers, variables, keyboard shortcuts, and has a connection wizard for easy management of different player characters and MUDs.